In the resting muscle fibre, tropomyosin partially covers

Calcium binding sites on actin

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Myosin binding sites on actin

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Actin binding sites on myosin

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Calcium binding sites on troponin

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Solution

The correct option is B Myosin binding sites on actin
In the resting muscle fibre or relaxation of muscle, the action potential stops. Calcium ions are pumped back into the sarcoplasmic cisternae resulting in masking of the myosin binding sites on actin filament. This is due to the troponin-tropomyosin complex masking the myosin binding site on the actin molecule.

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Similar questions

\begin{matrix} A. Muscle covering & 1. Endomysium B. Muscle fibre bundle & 2. Epimysium C. Muscle bundle covering & 3. Fascicle D. Muscle fibre covering & 4. perimysium \end{matrix}

\begin{matrix} A. Muscle covering & 1. Endomysium B. Muscle fibre bundle & 2. Epimysium C. Muscle bundle covering & 3. Fascicle D. Muscle fibre covering & 4. perimysium \end{matrix}

Name the following :

(a) Multinucleate muscle fibre ;

(b) Spindle shape muscle fibre.

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